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The species with largest ionisation potential

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Al⁺

Mg⁺

Li⁺

answer is A.

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Detailed Solution

electronic configuration of 'Li' is 1s² 2s¹.

When Li becomes Li⁺, then it achieves a noble gas configuration, 1s². Now, it is difficult to remove an electron from Li+.

So, Li⁺ has the largest ionization potential.

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